Term
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Definition
| Distance light travels in one year |
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Term
| Why are light years used to measure distances in the Universe? |
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Definition
| Because galaxies are so large and the distance between them is so great |
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Term
| Order of planets from the sun outward |
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Definition
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
(My Very Eager Mother Just Served Us Nachos) - (remember Mercury starts with m and ends with y, just like MY) |
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Term
| Two factors that affect gravitational force |
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Definition
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Term
| How does mass affect gravitational force? |
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Definition
Greater mass = greater gravitational force
Less mass = less gravitational force |
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Term
| How does distance between two objects affect gravitational force? |
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Definition
Greater distance = Less gravitational force
Less distance = greater gravitational force |
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Term
| What happens to gravitational force when the mass of an object increases? |
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Definition
| The gravitational force increases |
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Term
| What happens to the gravitational force when the mass of an object decreases? |
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Definition
| The gravitational force decreases |
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Term
| What holds planets into their spherical shapes? |
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Definition
| Gravitational force acting evenly in all directions around the center of the mass |
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Term
| What would happen if Earth's gravitational force suddenly disappeared? |
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Definition
| The moon and artificial satellites would move out into space in a straight line. |
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Term
| Which is larger, Earth or our solar system? |
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Definition
| Our solar system is larger than the Earth. |
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Term
| Which is smaller, our solar system or the Milky Way Galaxy? |
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Definition
| Our solar system is smaller than the Milky Way Galaxy |
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Term
| How many planets are in our solar system? |
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Definition
| There are 8 planets in our solar system |
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Term
| Which is larger, the Milky Way Galaxy or the universe? |
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Definition
| The universe is larger than the Milky Way Galaxy. |
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Term
| Which is smaller, Earth or the Milky Way Galaxy? |
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Definition
| Earth is much smaller than the Milky Way Galaxy. |
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Term
| Timeline for discovery of Earth's location in the solar system, galaxy, and space |
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Definition
1. No telescope: early astronomers saw bright objects and proposed there were many stars in the Milky Way
2. With telescope: astronomers could see that Earth was in the Milky Way
3. With telescope: astronomers found the center of the Milky Way and determined Earth was not in the center
4. science and engineering brought better telescopes to see other galaxies |
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Term
| Evidence of heliocentric solar system |
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Definition
| Copernicus used math to show distance from Earth to other celestial bodies |
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Term
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Definition
| Outer planets, they are larger and made up of gas. Jupiter, Saturn, Uranus and Neptune |
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Term
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Definition
| Inner planets, they are smaller and rocky, Mercury, Venus, Earth, and Mars |
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Term
| Why do astronomers use models for items in the solar system, galaxy and universe? |
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Definition
| Astronomers use models to show the relative sizes of items in the solar system, galaxy and universe. These items are so massive that they could not show them in actual size. And, the distance between items in the solar system are so great that they could not show the actual distances. |
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Term
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Definition
| holds the planets and other objects in their orbit around the sun in our solar system |
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Term
| How the solar system was formed. |
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Definition
1. Gravity and heat in the center of a collapsing nebula caused matter to ignite and undergo fusion.
2. Dust and gas were pushed outward while the sun's gravity pulled matter inward, which flattened the cloud into a large disk.
3. The disc rotated around the sun and formed geocentric rings.
4. Matter collided and fused with the rings, forming the planets. |
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